Actual quora question is Fake it until you make it example, but I take a different lesson : https://qr.ae/pNizfs
In the book, Science of Givings, Daniel Oppenheimer documented an interesting observation from a social experiment.
Having some money in the box significantly increased giving. When the box was empty, giving was at its lowest.
People tended to give what they saw in the box, no matter what the sign said. When the composition of the box was altered, the composition of the donations also changed. In other words, if people saw bills, they tended to give the same denominations of bills. If they saw coins, they gave less – i.e. coins.
So, you fake something (or on author's take, create a demand or entry first) as gaining traction, to motivate people to jump on the bandwagon. It’s simple psychology.
It there's something, people have more tendency to jump on something rather there's nothing.